1. The ratio of boys and girls in a camp is 9:8. If the number of boys is 18. Find the number of girls.2. The ratio of apples to oranges in a box is 2:11. Find the number of apples if the number of oranges is 121.3. Find the fourth proportional of 5, 9 and 45.4. Find the mean proportional between 4 and 9.5. Find the fourth proportional of 3, 6 and 18.